*{
    margin: 0;
    padding: 0;
}

.important{
    color: red;
    font-size: large;    
}
.red{
    width: 200px;
    height: 150px;
    background-color: red;
}
#boxexam1{
    width: 200px;
    height: 200px;
    background-color: aqua;
    margin: 10px;
    padding:10px;
    border: 10px solid black;
}
#boxexam2{
    width: 200px;
    height: 200px;
    background-color: aqua;
    margin: 10px;
    margin-top:20px;
    padding:10px;
    border: 10px solid black;
}

.buttonMenu{
    width:800px;
    height: 200px;
    background-color: yellow;
}
.myBtn{
    margin:20px;
    width:200px;
    height:150px;
    
    background-color: antiquewhite;
    border: 10px solid black;
    text-align: center;
    /*行高设置为和高度一样，可以实现单行内容的垂直居中*/
    line-height: 150px;
    font-size:2em;
    color: red;
    
    text-shadow: 0 0 10px red;
    border-top:10px solid rgb(193, 189, 189);
    border-left:10px solid rgb(193, 189, 189);
    border-radius: 10px;
}
.myBtn:hover{
    margin:20px;
    width:200px;
    height:150px;
    background-color: antiquewhite;
    border: 10px solid black;
    text-align: center;
    /*行高设置为和高度一样，可以实现单行内容的垂直居中*/
    line-height: 150px;
    font-size:2.2em;
    color: rgb(137, 25, 25);
    text-shadow: 0 0 20px rgb(134, 14, 14);
    border-top:10px solid rgb(246, 243, 243);
    border-left:10px solid rgb(244, 243, 243);
    border-radius: 10px;
}
.myBtn:active{
    margin:20px;
    width:200px;
    height:150px;
    background-color: rgb(248, 201, 139);
    border: 10px solid black;
    text-align: center;
    /*行高设置为和高度一样，可以实现单行内容的垂直居中*/
    line-height: 150px;
    font-size:1.7em;
    color: red;
    text-shadow: 0 0 10px red;
    border-bottom:10px solid rgb(193, 189, 189);
    border-right:10px solid rgb(193, 189, 189);
    border-radius: 10px;
}
